I suggest you download the addon Better Wardrobe. You can see more of the sets in game from questing gear to random greens. Mail looks okay with some of those. I use it on all my characters. It does the blizzard default sets for tier sets for everything and it’s awesome for transmog. I think mail has some decent non tier sets. The good stuff is locked behind myhtc raids which haven’t been so soloable as previous expansions.